Photographic film of the monopack type adapted for color photography



Patented F'eb. 18, 1936 rno'roenarnro mm 01 m Monomers ma anar'rnn Eon-coma PliGRA-- PHY' Hans vorrFraer, New York, N. 1:, to Omnichrome Corporation, New York, .N. 1.,

- a corporation or New York Drawing. Application August 3, 1934,

Serial No. 738,298

13 Claims. (Cl- 95-2) This invention relates to improvements in photographic films oi the mono-pack type adapted for color photography, being particularly directed to sensitized multi-strata films adapted for ex-' posure through the emulsion as difierentlated y from exposure through the carrier, and methods for producing such sensitized multi-strata films. Attempts have been made to provide stratified mono-pack films which may be exposed from the emulsion side by applying separate layers of color sensitized emulsions one on top of another, onto a carrier such as, for example, an emulsion layer sensitized to the warm color, as, for instance, red,

. has been deposited on a carrier such as celluloid,

and dried. Thereafter, there has been deposited on such layer a second layer of emulsion which may have been previously sensitized to a colder color or which is sensitized to a colder color after application; Color filters have in some instances been added in separate steps. In this manner,

carrier and from in front of which exposure may take place, sensitized to the colder colors, such sensitizing operation with respect to the single emulsion layer being a single step procedure.

Broadly, it is an object of this invention to provide for the formation of a multi-strata color sensitive formation in a single emulsion layer disposed on a carrier through the medium of disposing the colorsensitizing and filter media on a carrier and coating the carrier with a single layer emulsion, whereupon the color sensitive and filter media are caused to difluse upwardly into the emulsion to provide a multistrata sensitization thereof, with the stratum adjacent the carrier being sensitized to the warmer colors and the stratum further distant from the carrier being sensitized to 'the colder colors, thereby providing for an entrant stratum as regards exposure sensitized tothe colder colors and an emergent stratum as regards exposuresensitized to the warmer colors.

To carry out the production oi one type of film sensitized for color photography 0! this type, I apply. for example, a waterproof opaque pho- 8 9 0 paper. I coat the water-proof paper with a sub-stratum incorporating gelatine of a' thickness or .0001 inch; upon the-paper as thus coated I'apllly as by brushing or spraying a coating of a sensitizing solution incorporating color sensitizers for the warm and cold colors plus filter dyes having absorptive qualities as regards certain color components of white light,

such as green and blue, the sensitizing and filter dyes being of varying particle size ranging from crystalloidal to colloidal in an aqueous-alcoholic solution. The respective color sensitizing and filter dye particlespenetrate into the gelatine binder forming the sub stratum on the paper, and

after drying the aqueousalcoholic solution is sub stantially evaporated, leaving respectively color sensitizing and filter dye particles in suspension within the sub-stratum into which they have I thereafter apply a coating 01 warm standard photographic emulsion incorporating silver salts, of a'thickness on the order of .0045 inch, whereupon the emulsion layer unites with the substratum and the color sensitizing and filter dye particles carried in thesub-stratum proceed to difiuse upwardly into the emulsion layer, such difiusion being dependent on the particle size of the dyes, with the result that a multi-strata formation is produced in the emulsion, the respective strata of which are color sensitized, the

stratum adjacent the sub-stratum being sensitized to the warmer colors and the strata distant from the sub-stratum orthe carrierbeing sensitized to the colder colors, the filter dyes serving to limit by absorption any passage'of particular color component of light within the respective strata being present in the respec-x tive strata dependent upon their difiusive properties.

A specific sensitizing solution applied by myself for the production oi three-strata sensitized mono-pack film oi the type above described is as follows: a

According to my process, I apply to the emulsion of the ordinary black and while monochromatic film a sensitizing solution which may, for

the purpose of this disclosure, be considered a colloidal suspension in the form of. dye particles in difierent sizes to provide stratification, and which incorporates in a dispersion medium oi alcohol and water color sensitizing and filtering dyes oi,the following nature and in the following proportion:

For the warmer colors pinacyanol or cyanin'e, relatively large particles in -alcohol;.

For the cold colors, p and erythrosine in aqueous solutio' andOrthochrome'T in alcoholic'solution, the particles being relatively ofdissolve 1 g. of Pinorthol I, which comprises essentially of a mixture of Pinachrome and erythrosine and a slight amount of Rapid Filter Yellow, 1 g. of Rapid Filter Yellow and .4 g. of rose bengal, inorder, 150 c.,c. of water: I then add to the above solution 25 c. c. of 1/10Q0 alcohol solution of Pinacyanol and 25 c. c. 0151/ 1000 alcohol solution of Orthochrome T, with stirring, after which I add 200 c. c. of alcohol, and then add water until the solution makes up to 500 c. c., with stirring.

Upon-applying the warm emulsion carrying a silver-salt to a paper in the sub-stratum of which the above solution incorporating color sensitizing and filter dyes has been introduced, a threestrata formation is imparted to such emulsion layer; in the stratum adjacent the sub-stratum we find the silver salt sensitized to record 'the color red and its derivatives by the reaction .Pinorthol I and Orthochrome T, and the emulsion in such stratum has. incorporated therein Rapid Filter Yellow and rose benga'l to"absorb the blue component of light or excess green component of light that enters such stratum.

In the third stratum formed above thegreen sensitized stratum we find the silver salt unaffected as to reaction with color sensitizing dyes,

but within this stratum is found Rapid Filter Yellow, which absorbs excess of the blue component of light entering suchstratum.

Since the reaction ofthe silver-salt in the respective strata upon exposure has been described in detail in my copending application. Serial No. 738,299, filed AugustBrd, 1934, and assigned to the Omnichrome Corporation, assignee of this application, a brief description thereof will be given herein. Upon exposure of the film in a direction towards the emulsion, the blue component of light will affect the normallyblue reacting unsensitized silver salt in the entrant stratum; the Rapid Filter Yellow serving. to absorb all blue light not afiecting the silver salt in such stratum and restrict its passage into the next adjacent stratum. The green component of light will be recorded in the middle stratum due to its effect to the reaction product of the green sensitizing dye with the silver salt in such stratum; and the rose bengal or minus green filtering medium will absorb the green color component of light not affecting the sensitized silver salt in such stratum and prevent its passage into the next adjacent stratum, while the Rapid Filter Yellow absorbs the blue component of light entering such stratum. Into the last stratum,"

the stratum containing silver salt sensitized to er colors, only the red and warmer color components of light will affect the same, the rose vbengal and Rapid Filter Yellow present in such red sensitized stratum serving to absorb any green or blue components that might enter into such stratum. s

Itshould be understood that although I have specified the use of a water-proof photographic paper for ordinary separate roll film or pack work this method of sensitizing a single layer for a cyanine, No. 806. Orthochrome T, No. 807, erythrosine, No. 772, rose beng'al, No. 77?, Rapid Filter Yellow, No. 640.

It is obvious that various changes and modi- 7 fications maybe made to the details of component applied and the process involved without tie-'- parting from the'general spirit of the invention as set forth in the appended claims.

I claim:

1. A method of forming a sensitized monopack film comprising uniformly coating'a carrier with a homogeneous solution incorporating color sensitizing dyes and filter dyes of varying particle size and rate of diffusion and superimposing on such coating a layer of emulsion, and thus permitting the color sensitizing dyes and filter dyes to diffuse upwardly from the carrier into the emulsion.

2. A method of forming a sensitized mono-pack film comprising uniformly coating a carrier with a homogeneous solution incorporating color sensitizing dyes and filter dyes ofvarying particle size and rate of diffusion and superimposing on such coating a layer of emulsion, thus permitting the color sensitizing dyes and filter dyes to difiuse upwardly into the emulsion to provide a multistrata formation, each stratum of which is affected to record diiferent color aspects respectively in order from the carrier, from the warmer to the colder colors.

3. A method of forming a sensitized monopack film comprising uniformly'coating a carrier with ahomogeneous solution incorporating color sensitizing dyes and-filter dyes of varyin particle size and rate of diffusion and superimposing on such coating a layer of emulsion, thus permitting the color sensitizing dyes and filter dyes t'o difluse cupwardly into the emulsion to provide a threestrata formation, each stratum of which is affected to record different color aspects i'espec-= tively in order from the carrier, from the warmer to thecolder co1ors.-

4. A method of forming a sensitized mono-pack film comprising uniformly coating a carrier with a homogeneous solution incorporating color sensitizing dyes and filter dyes of varying'particle size and rate of diffusion and superimposing on such coating a layer of emulsion, thus permitting the color sensitizing dyes and filter dyes to diffuse i,

upwardly into the emulsion to provide a threestrata,formation, each stratum of which is affected to record different color aspects respec tievly in order from the carrier from the warmer to the older colors, the first stratum adjacent the .car er being affected to record red and its derivatives, the next adjacent stratum being affected to record green and its derivatives, the furthermost stratum being affected to record blue andits derivatives.

5. A method of forming a sensitized mono-pack film comprising uniformly coating a carrier with a homogeneous solution incorporating color sensitizing dyes and filter dyes of varying particle size and rate of difiusion and superimposing on such coating a layer of emulsion, thus permitting the color sensitizing dyes and filter dyes to difiuse upwardly into the emulsion to provide a multistrata formation, each stratum of which is affected 'to record different color aspects respectively in order from the carrier, from the warmer to the colder colors, and each stratum being affected as to exclude the recordations of color strata formation, each stratum of which is af-' fected to record different color aspects, respectively in order from the carrier, from the warmer to the colder colors, and each stratum being affected as to exclude the recordations of color accepted in the other strata.

7. A method of forming a sensitized mono-pack film comprising uniformly coating a carrier with a homogeneous solution incorporating color sensitizing dyes and filter dyes of varying particle size and rate of diffusion and superimposing on such coating a layer of emulsion, thus permitting the color sensitizing dyes and filter dyes to diifuse upwardly into the emulsion to provide a threestrata formation, each stratum of which is affected to record difierent color aspects respectively in order from the carrier, from the warmer to the colder colors, the first stratum adjacent the carrier being affected to record red and its derivatives,-the next adjacent stratum being affected to record green and its derivatives, the furthermost' stratum being afiected to record blue and its derivatives, and each stratum being afiected as to exclude the recordations of color accepted in the other strata.

8'. A method of producing a sensitized film comprising uniformly coating a carrier with a substratum, incorporating in the sub-stratum a homogeneous solution containing a series of color sensitive dyes and filter dyes of varying particle size and rate of difiusion and superimposing upon the sub-stratum a layer of warm emulsion,-

whereby to permit .the color sensitive dyes and filter dyes carried in the sub-stratum to diffuse upwardly into the emulsion to provide a multistrata formation in the emulsion layer, each stratum of which is afiected to record different color aspects.

9. A method of producing a sensitized film com prising uniformly coating a carrier with a substratum, incorporating in the sub-stratum a homogeneous solution containing a series of color sensitive dyes and filter dyes of varying particle size and rate of difiusion and superimposing upon the sub-stratum a layer of warm emulsion, whereby to permit the color sensitive dyes and filter dyes carried in the sub-stratum to difiuse upwardly into the emulsion to provide a multistrata formation in the emulsion layer, each stratum of which is affected to record difierent color aspects, and to exclude in such strata the color aspects recorded in the other strata.

10. A method of producing a. sensitized film a comprising uniformly coating a carrier with a sub-sin'atum incorporating in the substratum a homogeneous solution containing a series of color sensitive dyes and filter dyes of varying particle size and rate of diffusion and superimposing upon the sub-stratum a layer of warm emulsion,

whereby to permit the color sensitive dyes and J filter dyes carried in the substratum to diffuse upwardly into the emulsion to provide a multistrata formation in the emulsion layer, each stratum of which is afiected to record difierent color aspects, the respective strata being affected to record different color aspects respectively from the-warmer to the colder colors.

, 11. A method of producing a sensitized film comprising uniformly coating a carrier with a sub-stratum, incorporating in the sub-stratum a homogeneous solution containing a series of color,

sensitive dyes and filter dyes of varying particle size and rate of diffusion and superimposing upon the sub-stratum, a layer 01 warm emulsion,

whereby to permit the color sensitive dyes and filter dyes carried in the sub-stratum to diffuseupwardly into the emulsion to provide a multistrata formation in the emulsion layer, each stratum of which is aifected to record different color aspects, the respective strata being afiected to record difierent color aspects respectively from the warmer to the colder colors, and to exclude in such stratum the color aspects recorded in the other strata.

12. A method of producing a sensitized film comprising uniformly coating a carrier with a sub-stratum, incorporating in the substratuma homogeneous solution containing a series of color sensitive dyes and filter dyes of varying particle size and rate of difiusion and superimposing upon the sub-stratum a layer of warm emulsion, whereby to permit the color sensitive dyes and filter dyes can'ied in the sub-stratum to difiuse upwardly into the emulsion to provide a multistrata formation in the emulsion layer, each stratum of which is affected to record difierent color aspects, the stratum first adjacent the substratum being afiected'to record the color red and its derivatives, the next adjacent stratum being affected to record the color green and its derivatives, and the furthermost stratum being afiected to record the color blue and its derivatives.

13. A method of producing a sensitized film comprising uniformly coating a carrier with a sub-stratum, incorporating in the sub-stratum a homogeneous solution containing a series of color. sensitive dyes and filter dyes of varying particle size and rate of diffusion and superimposing upon the sub-stratum a layer of warm emulsion, whereby to permit the color sensitive dyes and filter dyes carried in the sub-stratum to difiuse upwardly into the emulsion to provide a multistrata formation in the emulsion layer, each stratum ofwhich is affected to record difierent color aspects, each stratum being affected to excludegn such stratum the color aspects recorded in the other strata. 

